What this covers
Blown-in insulation is loose-fill cellulose or fiberglass broken up in a blowing machine and pushed through a long hose into place. In attics it settles into an even blanket that fills around joists, wires and pipes better than batts can. In closed walls it is dense-packed through small holes so it fills the cavity and stays put. The crew protects the path from the truck to the attic, seals ceiling gaps and fits baffles before blowing, then levels the layer to the target depth. Careful work checks the depth in several places and the bag count against the coverage chart.
When to call
- An attic with thin or uneven insulation that needs topping up.
- Closed walls in an older house with no insulation.
- Insulation removed after a roof leak or attic fire that needs replacing.
What to expect
- PrepareThe path is protected, ceiling gaps are sealed and baffles are fitted at the eaves.
- Set upThe blowing machine is set up outside and the hose run to the attic or wall.
- BlowInsulation is blown to an even depth or packed to density in each wall bay.
- CheckDepth is measured in several places and the hatch or holes are closed.
Get a certified company
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Questions people ask
Cellulose or fiberglass?
Both work well. Cellulose is made from treated recycled paper and is often used for dense-pack walls; fiberglass is lighter and does not absorb water. The installer explains the choice for your house.
Does blown-in insulation settle?
Loose fill settles slightly over time. Installers account for this by blowing to the settled depth listed on the bag, not just the depth on the day.
Is it messy?
The machine stays outside and the hose runs in, so most of the dust stays in the attic. The crew covers the path through the house and cleans up afterward.
Related: Attic insulation · Wall insulation · Air sealing · All insulation and energy
This page describes what the service involves. The company you hire sets the scope, the schedule and the price, and your contract is with that company. We verify credentials and collect reviews from real jobs. We do not guarantee any company's workmanship. Safety steps are general guidance. When in doubt, leave the home and call 911.